Attachment for punch presses



Sept. 11, 1928.

G. H. PICKHARD ATTACHMENT FOR PUNCH PRESSES Filed March 1925 3 Sheets-Sheet 1 Sept. 11, .1928. Y 1,683,799

G. H. PICKH'ARD ATTACHMENT FOR PUNCH PRESSES 3 Sheets-Sheet 2 Sept. 11, 1928.

G. H. PICKHARD ATTACHMENT FOR PUNCH PRESSES Filed March 1925 3 Sheets-Sheet 3 mNf fizz/19721 077 Gea g'elfa'cfiard,

. or overflow tube of the core.

Patented Sept. 11, 1928.

UNITED STATES v l.,5j83,799

rarest orifi e GEORGE H. PICKHABD, F DETROIT, MICHIGAN, ASSIGIEOR TO MOCORD RADIATOR 8c MFG. 00., OF DETROIT, MICHIGAN, A CORPORATION OF MAINE.

- I ATTACHMENT FOR PUNCH PRESSES.

Application filed March 7, 1925. Serial no. 13,779.

Top tanks for motor vehicle radiators are usually made from sheet metal, such as brass, by a drawing operation, and have substantially flat front and rear walls and a top wall with a centrally-disposed opening for the filler neck of the core. r i In this type of tank, the casting for the upper water connection is riveted to the rear wall about an inlet opening formed therein, with the base flange of the casting seatingin a depression or recess in therear wall of the tank about this opening. Also there is a shield or bathev platein the tank extending at an upward inclination from the front wall across the inlet opening to prevent water being forced into the tank by the pump in the cooling system from splashing up into the filler neck and running out of the vent This shield or baflie plate is riveted at its lower end to the front wall of the tank and the vent or overflow tube passes through the rear wall of the tank at one side of the plate. The form of opening for this tube is covered by Patent No. 1,568,526, granted January 5, 1926, to Charles \V. Owston.

The main object of my invention is to provide a punch and die operating mechanism for use as an attachment for a punch press for punching in a singleoperation all of the rivet holes in the front and rear walls of the tank for the casting and shield plate, respectively, and also the recess for the casting, as wellas the opening in the rear wall of the tank for the vent or overflow tube, thus combining in one operation all-oi the steps which heretofore have required several separate operations.

A further object of my invention is to so construct the punch operating mechanism that thedeseent of the upper punch will cause the lower punch to move upward and pierce the rivet hole in the front wall of the tank for the shield or bafile plate simultaneously with the piercing of the rear wall of the tank in making the rivet and other holes for the casting and the depression or recess for the base of the same. Other and further objects of my inventio will appear from the following specification, taken in connection with the accompanying drawings, in which- 7 Figs. 1 and 2 are top and rearvicws, re-' spectively, of the top tank after being oper ated on by a punch and die construction of my invention; i e Fi 3 is an enlarged vertical sectional view on line 33 of Fig. 2 with the casting secured in place; a

4 is a side view of a punch press equipped with a device of my invention;

Fig. 5 is an enlarged horizontal sectional view on line 5-5 oi Flg. 4;, and looking down on the upper die;

Fig. 6 is avertical sectional view on line 66 of Fig. 5 with the punches shown separated from, their associated dies; i

Fig. 7 is a similar view showing the punches engaged with their respective dies;

8 is a vertical sectional view on line 8.-8ofFig.5; I

Fig. 9 is a horizontal sectional View through the upper punch on line 9 -9 of Fig. 6; and I Figs. 10 andll on lines l0-10 and Fig; 9. y

The top tank shown in Figs. 1 to 3 isdrawn from sheet metal. preferably brass, and has substantially flat front and rear walls 1 and 2. The top wall3, in the form of tank shown, is curvedffrom the center otthe tank toward its ends and has a centrallydisposed opening are vertical sectional views 11 11, respectively, of

4 for the filler neck (not shown) of the radiar tor core.

An elongated horizontal opening 5 is punched in the rear wall 2 midway between the ends of the tankto provide an inlet open;- ing for the casting 6 of the upper water-cork nection. Around the opening 5 there is an outwardly projecting flange to fit inside of the casting 6, asshown in'Fig. 3, so that no gasket is required. The base flange ofthis casting 6 seats in a depression or recess 7 formed in the wall 2 about the flanged opening5. The casting is securedto the wall 2 in this recess by four rivets'S, 8, preferably at the corners otthe casting, Thedepression or recess 7 is rectangular, as'shown in Fig. 2, so as to receive the like shaped base of the casting 6 a In the tank there isa shield or ha-flie plate 9 extending at aninclination upward from the front wall]. to the rear wall 2 across theopening 5, as shown in Fig. 3. This plate Q-is secured by a single rivet l0 to the front wall 1- and is ot a size or area to extend on opposite sides of thropemng 5 (Fig.2) so as to pr sent the waterbeing forced into the tank by the pump in the system from splashing up in the opening 4- and escaping by the vent or overflow tube 11, which enters the rear wall 2 of the tank at a point offset to one side of the casting 6. The upper end of this tube 11 extends into the filler neck (not shown) throughthe opening 4, as in radiator design.

The opening 12in the rear wall 2 for the tube 11 is formed by first slitting the wall 2 along a straight line approximating the outside diameter of the tube and then forcing the metal of the wall on opposite sides of the slit out of theplane of the wall so that the portion of the metal on one side of the slit extends into the tankand the other on the other side of the slit on the outside of the tank, as shown in Fig. 1. These metal portions are, curved to fit the curvature of the tube 11 where it enters the tank, as described and claimed in the coopending application of Charles'W. Owston, as aforesaid.

The punch and die mechanism of my invention is shown in Figs. 4; to'S. This mechanism includes an upper punch 13, a lower punch 14, and co-operating dies 15 and 16 between them, as shown in Figs. 6 and 7. The upper punch 13 is carried on the under side of a punch holder 17 on the reciprocating ram or other movable part 18 of the punch press. The punch 13 has four piercing punches19, 19 co-operating with a like 1mmbe1-ofholes 20, 20 in the upper die 15 to pro-. duce holes for the four rivets 8, 8 which secure the casting 6 t therear wall of the tank. This upper punch 13 is provided with a centrally disposed piercing member 21 co-opera-ting with a hole 22in the upper die 15 to produce the-elongated opening in the rear wall of the tank. The upper punch 13 is further provided with an impression plate or section 1 23 surrounding the punch 21 and co-operating with a recess 24 in the upper die to depress the portion of the tank wall 2 around the opening 5 to make a flangeabout the latter and also the seating recess 7 fort-he base flange on the casting 6. The hole 22 continues through the die supporting projection 25 of the attachment 26 to discharge the slugs formed in punching the hole5. As shown in Figs. 7 and, 8,-the holes '20 also continue 1 through this support for the same purpose.

The lowerpunch 14 isa piercing punch and co-operates with the lower die 16, to make the hole for the single rivet lOfor fastening the plate 9 to the frontwall 1. The lower die 16 has a slug receiving opening 27 leading to the main passage 22. The tank 1- after being blanked with hole 4 in its top wall is placed over the projection 25 so that its rear wall 2 is on top of the upper die 15 and its front wall 1 is on the under side of the lower die 16, as shown in Fig.7.

A plunger 28 is secured to the upper punch carrier 17 and extends down into a bore or pasbore is parallel with the bore 29 and is also ofi'set outwardly from it, as shown. The

lower end of this plunger 30 is also beveled or out off at The bores 29 and 31 open at their lower ends into a cross bore 32 in which slides a short plunger 33 cut oil at 45 angles at both ends to provide co-operating cam surfaces for those on the adjacent lower ends of the plungers 28 and 30.

The plunger 30 carries a downwardly extending steel rod 34, which extends through an elongated slot 35 in the outer beveled end of the short plunger 33. This slot allows this third plunger to slide back and forth in its bore without hindrance by the rod 34. A coiled spring 36 is about the lower endof the rod and bears against thebed or other fixed part of the punch press and serves to normally draw the plunger 30 downward.

In operation, when the upper punch 13 is moved downward by the action of the press, the first plunger 28 is carried downward and as soon as its beveled lower end strikes the adjacent beveled e'nd of the third plunger 33, the latter is forced forward and acts on the lower end of the second plunger 30 to raise the lower punch 14 and cause it to pierce a single hole in'the front wall of the tank, simultaneously with the operation of the upper punch 13 on. the tank wall 2.

On return of the upper punch 13 by the press, the plunger 28 is raised and the spring 36 then acts to move the plunger 31 downill! ward and forces the third plunger 33 rearward to be reset for the first plunger 28.

To make the opening 12 for the tube 11, a punch 37 and a die 38, in the form of separate plates, are respectively secured to the carrying parts for the upper and lower punch 13 and die 15, respectively, as shown in Fig. 8. This punch and die construction 3738 is provided with co-oj'ierating-projections and recesses to form the tube opening 12, as shown.

The entire structure shown and described is adaptable as an attachment for punch presses,-and enables all of the rivet and other holes and the recess heretofore'described to be made in a single operation, this greatly,

facilitating the production of the tanks by scribed may be variously changed and modified wthout departing from, the spirit and:

scope of my invention.

The upper punch 13 has upper and lower plates 13, 13* comu-cled'togcther adjacent Fig. 6. On thedown stroke. the plate 23 is brought against the tank wall 2 and holds the tank on the die. A continued downward movement of the press forces the center punch 21 through the wall to make the elongated hole 5. The impression plate 23 follows into the recess 24 in the die to make the depression for the base flange of the casting 6. When the bottom of the recess 24 is reached, a continued downward movement of the press overcomes the resistance of the springs 13 and forces the piercing punches 19 through the tank wall to make the four rivet holes in said tank wall, as indicated in Fig. 10. On the up stroke of the press, the

lower plate l3 acts as a stripper for the punches 19 and 21.

I claim as mv invention:

1. The combination with. a punch press, of

an attachment therefor having a projection with upper and lower dies thereon and shaped to support a radiator top tank after being drawn from sheet metal, upper and lower punches on opposite sides of said projection and operating on the interposed tank walls to provide a plurality of openings and a depression in one wall and a single open- 1ng in the other wall, and means controlled by the movement by the press of the upper punch'into and out of engagement with the upper die for-effecting the simultaneous movement of the lowerpunch into and out of engagement with the lower die for operating simultaneously on both walls.

2. The combination with a punch press, of an attachment therefor having a projection with upper and lower dies thereon and shap ed to support a radiator top tank after being drawn from sheet metal, and upper and lower punches on opposite sides of the projection and operating on the interposed tank walls to simultaneously make in a single operation the rivet holes, the depression, port hole, and overflow tube opening in one wall of the tank and a single rivet hole for the splash plate in the'other wall, and means controlled by the action of the press for effecting the' simultaneous movement of said punches into and out of engagement with their respective dies.

3. An attachment for punch presses having a body member, with a lateral projection, upper and lower dies supported thereby, a pair of substantially parallel plungers slidably mounted in said body member with one plunger longer than the other and extending out of the body member for operation by a movable element of a punch press, a third plunger slidably mounted'in said body memher in transverse relation to the first two plun-gers and actuated by the longer plunger for moving :upw'ard theshorter plunger simultaneously with the downward movement of the longer plunger, and'a spring pressed rod connecting the shorterplunger for lowering the shorter plunger in the upward movement of the l ngerplunger and for resetting the third plunger for the longer plunger.

1.. An attachment for apunch press having a body member, upper and lower dies supportedthereby, upper and lower punches for said dies, a set of plungers all slidably mounted in and guided by said body member and as sociat-ed with said punches, said plungers co-' acting one on the other within said body memher in the movement by the press of one punch into engagement with its associated die for effecting the simultaneous movement of the other punch through said plungers into engagement with its associated die, and means. for effecting the movement of the last named punch from its die as the press moves the first punch from its die; 7

5. An attachment for a punch press having a body member, upper and lowerdies' supporte ed thereby, upper'and lower punches for said dies, first and second upright plungers slid ably mounted in said body member in substantially parallel, laterally spaced relation and respectively connected with said .upper and lower punches and extending downward therefrom, a third plunger slidably mounted in said body member at the lower ends of said first two plunge-rs and arranged transverse thereto, said plungers having coaoting cam surfaces at their adjacent ends for moving the second. plunger upward in the. downward movement by the press of the first plunger, and means for eifecting the movement of the. second plunger downward in the upward movement of the first plunger and for resetting the third plunger for said first plunger.

6. An; attachment for av punch press having a body member, upper and lower dies supported thereby, upper and lower punches for said dies, first and second upright plungers slid- Ion ably mounted in said body member in substana rod connected with the second plunger and extending downward therefrom, and a spring acting on the rod to normally move the second plunger downward and causing resetting of" the third plunger in the upward movement by i i the press of the first one.

7. An attachment for a punch press having a body member, upper and lower dies supported thereby, upper and lower punches for said dies, first and second npright plungers slidebly mounted in said body member in substantially parallel, laterally spaced relation and respectively connected with said upper and lower punches and vextending downward therefrom, a third plunger slidably mounted in said body member at the lower ends of the first two plungers and arranged transverse thereto, said plungers having coacting cam surfaces at their adjacent ends for actuating GEORGE H. PICKHARD." 

